Pass in an image for the color of the chroma key filter

[otusweb]

I'm trying to use your chroma key filter and right now I have to run two pass on my image, first getting the average color of a small area of the image, then extract the color from the returned image, then pass that color to your chroma filter, then run the chroma filter.

It would be great to be able to chain those two filters. Any idea how i could do that?